TY  - RPRT
TI  - Missing values ignored.
AU  - S Sayers
AU  - J Powers
PY  - 1997
DO  - 10.1111/j.1440-1754.1997.tb01026.x
UR  - https://pubmed.ncbi.nlm.nih.gov/9145367/
ID  - 9145367
ER  -